package com.liao.myblog.advice;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.liao.myblog.enums.ResultCode;
import com.liao.myblog.vo.ResultVO;
import org.springframework.core.MethodParameter;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyAdvice;

@ControllerAdvice(basePackages = "com.liao.myblog.controller")
public class ResponseControllerAdvice implements ResponseBodyAdvice<Object> {

    @Override
    public boolean supports(MethodParameter returnType, Class<? extends HttpMessageConverter<?>> converterType) {
//        System.out.println("=========="+returnType.getParameterType());
        return !returnType.getParameterType().equals(ResultVO.class);
    }

    @Override
    public Object beforeBodyWrite(Object body, MethodParameter returnType, MediaType selectedContentType, Class<? extends HttpMessageConverter<?>> selectedConverterType, ServerHttpRequest request, ServerHttpResponse response) {
        if (returnType.getParameterType().equals(String.class)) {
            ObjectMapper objectMapper = new ObjectMapper();
            try {
//                System.out.println("ResponseControllerAdvice.beforeBodyWrite=="+body);
                return objectMapper.writeValueAsString(new ResultVO<>(body));
            } catch (JsonProcessingException e) {
                return new ResultVO<>(ResultCode.ERROR);
            }
        }
        return new ResultVO<>(body);
    }
}